scale_by_pixel_area

Calculates the area (in meters) of each pixel in a raster, scales the value 
of each pixel by the area, applies the desired scale factor, and returns the 
result as a <code>RasterLayer</code>. Useful for calculating class areas based on 
a classified raster in a geographic coordinate system. Assumes that raster 
is not rotated (latitudes of every pixel in a given row are identical). 
Processes block by block to support handling very large rasters.

Supports analyses using the Global Forest Change dataset released
by Hansen et al. gfcanalysis was originally written for the Tropical Ecology
Assessment and Monitoring (TEAM) Network. For additional details on the
Global Forest Change dataset, see: Hansen, M. et al. 2013. "High-Resolution
Global Maps of 21st-Century Forest Cover Change." Science 342 (15
November): 850-53. The forest change data and more information on the
product is available at <http://earthenginepartners.appspot.com>.

Matthew Cooper

gfcanalysis

Tools for Working with Hansen et al. Global Forest Change
Dataset

Alex Zvoleff

scale_by_pixel_area function

<dl><dt>x</dt>
<dd>a <code>Raster*</code> object</dd>
<dt>filename</dt>
<dd>(optional) filename for output raster</dd>
<dt>datatype</dt>
<dd>(optional) datatype for output raster see 
<code>dataType</code> NOT YET SUPPORTED</dd>
<dt>pixel_areas</dt>
<dd>a vector giving the area of each cell in a single column 
of the raster. See <code>calc_pixel_areas</code>. If NULL, this vector will 
be calculated based on the coordinate system of <code>x</code>.</dd>
<dt>scale_factor</dt>
<dd>a value to scale the results by</dd></dl>

Arguments

Scales a raster by the area of each pixel in meters — scale_by_pixel_area

<dl>

<dt>x</dt>
<dd>a <code>Raster*</code> object</dd>


<dt>filename</dt>
<dd>(optional) filename for output raster</dd>


<dt>datatype</dt>
<dd>(optional) datatype for output raster see 
<code>dataType</code> NOT YET SUPPORTED</dd>


<dt>pixel_areas</dt>
<dd>a vector giving the area of each cell in a single column 
of the raster. See <code>calc_pixel_areas</code>. If NULL, this vector will 
be calculated based on the coordinate system of <code>x</code>.</dd>


<dt>scale_factor</dt>
<dd>a value to scale the results by</dd>

</dl>

scale_by_pixel_area: Scales a raster by the area of each pixel in meters

Description

Usage

Value

Arguments